I'm trying to decide if I need to purchase an iPad with cellular capabilities. My current iPad (1st Gen) has cellular, but I only activate the plan if I'm taveling for a long time. Otherwise, I just use wifi. So, if I can get a new iPad and tether that to my iPhone, I'm hoping to get by with a wifi-only iPad. My cellphone plan supports tethering and cost extra cell data is not really an issue. Is tethering generally considered an adequate substitute to a direct cellular connection? Is there any other reason that I might need a cellular connection?